Thank you so much for the help.
I have attached the php code for the confirm page, and the checkout page. Right after I fill out the customer info and billing info, then click Checkout, the page I'm redirected to (confirm.php) is blank.
It worked yesterday for a while. I'm trying to implement two different shipping methods, USPS priority mail and Fedex overnight. I've only created a "Select from list" type of box in the upper section of the checkout page. I have not attached the PHP code for Fedex yet. Might this be the cause of the problem?